[Bug 2059303] Re: [UBUNTU 20.04] SE-tooling: New IBM host-key subject locality (s390-tools)
Frank Heimes
2059303 at bugs.launchpad.net
Sat Apr 6 18:56:46 UTC 2024
Hi Steffen,
thanks for checking the updated packages.
Indeed, I had to restart the build of the s390-tools-signed packages for mantic/23.10, /jammy/22.04 and focal/20.04.
These build will be complete in an hour or so (so well before Monday).
Since the updates need to be done starting with the newest to oldest, a
test on noble/24.04 would be most important.
Do you have a mantic/23.10 or jammy/22.04 test system over?
In this case you should be able to upgrade to noble/24.04 in just a few minutes.
First of all ensure that your current system (mantic or jammy) is up-to-
date with:
sudo apt update && && sudo apt full-upgrade
(with a potential reboot)
You should then be able to upgrade with:
sudo do-release-upgrade -d
(or in case you are brave enough - but on a test/dev system ;-) :
sudo do-release-upgrade --quiet --devel-release --frontend=DistUpgradeViewNonInteractive && sudo reboot )
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https://bugs.launchpad.net/bugs/2059303
Title:
[UBUNTU 20.04] SE-tooling: New IBM host-key subject locality
(s390-tools)
Status in Ubuntu on IBM z Systems:
New
Status in s390-tools package in Ubuntu:
In Progress
Status in s390-tools-signed package in Ubuntu:
In Progress
Status in s390-tools source package in Focal:
New
Status in s390-tools-signed source package in Focal:
New
Status in s390-tools source package in Jammy:
New
Status in s390-tools-signed source package in Jammy:
New
Status in s390-tools source package in Mantic:
New
Status in s390-tools-signed source package in Mantic:
New
Status in s390-tools source package in Noble:
In Progress
Status in s390-tools-signed source package in Noble:
In Progress
Bug description:
SRU Justification:
[ Impact ]
* Symptom:
* There is an issue with the Secure Execution (SE) tooling,
especially the new IBM host-key subject locality,
that leads to the fact that on April 24 (z15) / March 29 (z16)
users will notice that the tooling for Secure execution will no
longer detect that the provided IBM signing key for that generation
is a valid IBM signing key.
* The error message will contain "no IBM signing key found" or similar.
The respective tool will reject creating an encrypted request/image
as it could not verify the host-key for its validity.
* This affects the genprotimg, pvattest, and pvsecret tools.
(Please notice that these tools got introduced over time with different
s390-tools versions that belong to different Ubuntu releases).
* Problem:
* The new IBM signing keys no longer contain 'Poughkeepsie' as
'subject locality' and 'Armonk' is used.
* The SE tooling checks, beside other things, for the subject in the
IBM signing key.
* If the subject is not the expected one, the certificate is not
recognized as a valid IBM signing key.
And without a valid IBM signing key, the host-key verification
cannot succeed and users cannot build trustable SE images and
attestation or add-secret requests.
* Solution:
* Mitigations are available upstream.
* The fixes allow Armonk as additional locality in the subject
and allow potential mismatches in the locality of revocation list
or host-key issuer subject that may still contain Poughkeepsie
instead of Armonk.
[ Test Plan ]
* <detailed instructions how to reproduce the bug>
* The testing is required for all three affected tools:
genprotimg, pvattest, and pvsecret
* Without the fixed code, but with the new IBM signing keys
(that have 'Armonk' as 'subject locality'), users will get a msgs like:
"no IBM signing key found"
and the validation will fail.
* With the patches included, the validation will succeed.
[ Where problems could occur ]
* The tools genprotimg, pvattest, and pvsecret tools are affected.
Since they got introduced over time with different s390-tools versions
that belong to different Ubuntu releases, it's important to figure out the
commits/patches that are required for each release.
* The refactoring commit f6c6f0cc712433221fb0588c754e0d09884453dd
("rust/pv/test: Code + Certificate refactoring") is needed
for noble and mantic, but needs several adjustments due to context changes.
The code could be negatively affected and the build might even break.
(A test build in PPA mitigates such issues.)
* As host host-key issuer subject now Poughkeepsie and Armonk is allowed.
If the conditional statements are not properly coded, either Poughkeepsie
or Armonk might be allowed, which would fails in case the opposite is used.
(Testing if the IBM signing key is valid will mitigate this.)
* In worst case a broken detection of the host-key issuer subject may lead
to positive validations, regardless of the subject content.
(Testing if the IBM signing key is valid will mitigate this.)
* A test build for all affected Ubuntu releases (N, M, J and F) succeeded
and is available via this PPA:
https://launchpad.net/~fheimes/+archive/ubuntu/lp2059303
* These test packages will be pre-tested by IBM.
* This affected Secure Execution (SE) functionality only on s390x.
No other tools that are part of the s390-tools packages are affected
(or got modified in any way).
[ Other Info ]
* Secure Execution (SE) was introduced with in Ubuntu Server for s390x
with 20.04 LTS, hence 20.04 LTS and higher is affected.
* And with that the s390-tools versions that are still in service:
2.12.0-0ubuntu3.7 | focal-updates
2.20.0-0ubuntu3.2 | jammy-updates
2.29.0-0ubuntu2.1 | mantic-updates
2.30.0-0ubuntu1 | noble-updates / 2.31.0-0ubuntu4 | noble-proposed
* The following commits / patches need to be applied to the following
s390-tools versions:
* f6c6f0cc712433221fb0588c754e0d09884453dd
("rust/pv/test: Code + Certificate refactoring")
to noble, mantic
* 1a3d0b74f7819f5e087e6ecbf3ec879a05a88bbc
("rust/pv: Support `Armonk` in IBM signing key subject")
to noble, mantic
* d14e7593cc6380911ca42b09e11c53477ae13d5c
("genprotimg: support `Armonk` in IBM signing key subject")
to noble, mantic, jammy, focal
* d7c95265cdb6217b0203efa5893c3a27838af63c
("libpv: Support `Armonk` in IBM signing key subject")
to noble, mantic, jammy
* 2b5e7b049123aff094c7de79ba57a5df09471b2e
("pvattest: Fix root-ca parsing")
to noble, mantic, jammy
__________
Description: SE-tooling: New IBM host-key subject locality
Symptom:
On April 24 (z15) / March 29 (z16) user will notice that the
tooling for Secure execution will no longer detect that the provided
IBM signing key for that generation is a valid IBM signing key. The
error message will contain "no IBM signing key found" or similar. The
respective tool will reject creating an encrypted request/image as it
could not verify the host-key for its validity. This affects
genprotimg, pvattest, and pvsecret.
Problem:
The new IBM signing keys no longer contain 'Poughkeepsie' as 'subject
locality' and 'Armonk' is used. The SE tooling checks, beside other
things, for the subject in the IBM signing key. If the subject is not
the expected one, the certificate is not recognized as a valid IBM
signing key. With no valid IBM signing key, the host-key verification
cannot succeed and users cannot build trustable SE images and
attestation or add-secret requests.
Solution:
Mitigations are available upstream. The fixes allow Armonk as
additional locality in the subject and allow potential mismatches in
the locality of revocation list or host-key issuer subject that may
still contain Poughkeepsie instead of Armonk.
Reproduction: Use a new IBM signing key in the unpatched tooling.
The fix is required due to the circumstances described here:
https://www.ibm.com/docs/en/linux-on-systems?topic=systems-whats-new#iplsdkwhatsnew__title__2
This is required for all Ubuntu releases in service that support secure execution.
Therefore, Ubuntu 20.04 LTS (focal) and above are affected and need to be fixed.
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